[llvm] [RemoveDIs] C API: Add before-dbg-record versions of IRBuilder position funcs (PR #92417)

[Nikita Popov via llvm-commits]

https://github.com/nikic approved this pull request.

The C API changes look fine to me. Would be good if @alan-j-hu takes a look at the new OCaml changes.

https://github.com/llvm/llvm-project/pull/92417